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High-entropy Alloys

1. Lattice-distortion-induced strong medium-entropy alloys
2. Twinning-induced ductile high-entropy alloys
3. Precipitation-hardened high-entropy alloys

High-entropy alloys (HEAs) are alloys that are formed by mixing equal or relatively large proportions of (usually) five or more elements (From Wikipedia).

We design three types of high- or medium-entropy alloys;
1) VCoNi-based medium-entropy alloys enabled by the severe lattice distortion effect
2) VCrMnFeCoNi-based high-entropy alloys triggering the deformation twinning
3) 3 to 6 components medium to high-entropy alloys consisting of precipitates with BCC or FCC matrix.

These three strategies are aiming to develop ultra high-strength alloys for load- carrying applications at room temperature.

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Automotive Steels

1. Ultra high-strength steels design
2. Lightweight steels design

We design novel automotive steels based on Fe-Mn-Al-C system in order to obtain excellent a combination of strength-ductility.
Main strategies are to investigate nano- & micron-scale phase transformation & precipitation behaviors and to correlate them with mechanical properties.
We are focusing on the development of medium- and high-Mn steels and lightweight steels.

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3. Hot-press forming steel design

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TMCP Steels

Thermo-Mechanically Controlled Processed steels (TMCP)

TMCP involves controlled hot working and micro-alloyed steel compositions to control microstructure and mechanical properties.

We investigate the effect of alloying elements on the microstructural evolutions and related tensile and fracture properties. Our recent interest is to characterize the microstructures of the heat-affected zone (HAZ) in welds and to investigate their effects on the low-temperature fracture toughness.

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